ECG, TSH: IRBBB without any cardiac symptoms is common, and not specifically worrisome but can be seen in atrial septal defect, so if that were a clinical concern, an echocardiogram would be helpful. The TSH level is low and needs further evaluation. Here is a helpful article on low TSH. http://www.mdedge.com/ccjm/article/95238/endocrinology/approach-low-tsh-level-patience-virtue
Answered 5/27/2017
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